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To find the average of a particular column in R data frame, we can take the help of delta ($) operator.For example, if we have a data frame called df that contains a column x then we can find the average of column x by using the command given below −mean(df$x)Example 1Following snippet creates a sample data frame −x1

To find the mean of all matrices stored in an R list, we can use sapply function along with mean function. For example, if we have a list called LIST that contains some matrices then the mean of each matrix can be found by using the command given below −sapply(LIST,mean)Check out the below given example to understand how it works.ExampleFollowing snippet creates a list of matrices −M1

To update single value in an R data frame, we can use row and column indices with single square brackets.For example, if we have a data frame called df that contains two columns and ten rows and if we want to change the fifth value in second column to 10 then we can use the command given below −df[5,2]

The coordinate of a value in an R matrix is the row and column intersection that is the row and column index for that particular value. This can be found by using which function.For example, if we have a matrix called M that contains value starting from 1 to 20 then we can find the coordinate of value 5 by using the command given below − which(M==5,arr.ind=TRUE)ExampleFollowing snippet creates a matrix −M1

The agg() method in pandas Series is used to apply one or more functions on a series object. By using this agg() method we can apply multiple functions at a time on a series.To use multiple functions at once we need to send those function names as a list of elements to the agg() function.Example# import pandas package import pandas as pd # create a pandas series s = pd.Series([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) print(s) # Applying agg function result = s.agg([max, min, len]) print('Output of agg method', result)ExplanationThe object “s” has 10 ... Read More

The add_suffix is the panda Series function which is used to add a string suffix to the series index labels. this method will return a new series object with updated labels.This add_suffic method takes a string as a parameter, and using that string will update the series labels. It will add the given string after the index labels of the series.Example# import pandas package import pandas as pd # create a pandas series s = pd.Series([2, 4, 6, 8, 10]) print(series) result = s.add_suffix('_Index') print("Resultant series with updated labels: ", result)ExplanationIn this following example, we created a series ... Read More

In pandas Series functionalities we have a function called add() which is used to add a series object with another series object. It is also used to add a Series object with an integer value and with a python list.The series.add() method has a fill_values parameter. Which is used to handle the missing values effectively by substituting a float value to this parameter. By default the input to this fill_value parameter is Nan.Exampleimport pandas as pd import numpy as np sr1 = pd.Series(np.arange(1, 6)) print('Series Object 1:', sr1, sep='') sr2 = pd.Series(np.random.randint(10, 20, 4)) print('Series Object 2:', ... Read More

The basic operation of this add() method in series is used to add a series with another series, or with a list of values, or with a single integer. And it will return a new series with resultant elements.It supports the substitution of fill_values for handling missing data. We can fill Nan Values using the fill_value parameter of the series.add() method.If you want to add a series with a list, then the elements in the list must be equal to the number of elements in the series.Example# import the required packages import pandas as pd import numpy as np ... Read More

Pandas used to deal with large data sets, in that large data tables columns and rows are indexed with some names and those names are called labels. When we are working with datasets there may be some duplicate labels present in the data set.The duplication can lead to making incorrect conclusions on our data, it may impact our desired outputs. Here we are talking about label duplication, nothing but rows and column index names repeated more than 1 time.Let’s take an example to identify the duplicate labels in a DataFrame.Identifying duplicates in column labelsExampledf1 = pd.DataFrame([[6, 1, 2, 7], [8, ... Read More

Stack and unstack functions are used to reshape a DateFrame in the pandas library to extract more information in different ways.StackPandas stack is used for stacking the levels from column to index. It returns a new DataFrame or Series with a multi-level index. The stack method has 2 parameters which are level and dropna.The level parameter is used to stack from the column axis onto the index axis, the default value is 1, and we can give string, list, and integer. As well as dropna is used to remove rows in the resultant DataFrame/Series with missing values. By default it ... Read More